Rotary member and production process
AssigneeNissan Motor Co., Ltd.
InventorsEiji Hirai, Mitsuhiro Okuhata, Nobuo Kino, Keizo Otani
Life of this patent
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Abstract
A rotary member such as a member of a bearing, a rotating member of a transmission or a gear for a motor vehicle, includes a base region of a ferrous base material such as a steel. The rotary member is formed with a hydrogen blocking layer formed in a contact surface for contacting with a mating body in a relative motion. The hydrogen blocking layer includes a concentrated portion formed in the base region and made of a substance lower in hydrogen diffusion coefficient than the base material.
Claims22
A rotary member having a contact surface for contacting with a mating body in relative motion, with the aid of a lubricant, the rotary member comprising:
- a base region of a ferrous base material;
- and
- a hydrogen blocking layer formed in the contact surface for contacting with the mating body in the relative motion, the hydrogen blocking layer including a concentrated portion formed in the base region and made of a substance lower in hydrogen diffusion coefficient than the base material.
A process of producing a rotary member having a contact surface for contacting with a mating body in relative motion with lubrication, the process comprising:
- preparing a base region of a ferrous base material;
- forming a coating layer of a low hydrogen diffusion substance which is lower in hydrogen diffusion coefficient than the base material;
- and
- forming a concentrated portion by causing the low hydrogen diffusion substance of the coating layer to diffuse into the base material.
Dependencies are inferred from the claim text.